+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   102221 (1999 TT9) Classification: Main-belt Asteroid          SPK-ID: 2102221 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2221797280260146 3.6127e-08   a 2.466904626630592 1.19e-08 au q 1.91880842761969 8.6034e-08 au i 2.937818797262921 3.6723e-06 deg node 205.1857791837011 0.00011709 deg peri 205.2101155910299 0.00011836 deg M 149.1209048576059 2.0424e-05 deg tp 2458614.276808336431 (2019-May-10.77680834) 7.7104e-05 TDB period 1415.229804301451 3.87 1.024e-05 2.804e-08 d yr n .2543756490329809 1.8406e-09 deg/d Q 3.015000825641494 1.4544e-08 au   Orbit Determination Parameters    # obs. used (total)      521      data-arc span      7503 days (20.54 yr)      first obs. used      1999-10-07      last obs. used      2020-04-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50836      source      ORB      producer      Otto Matic      solution date      2020-May-20 18:06:29   Additional Information  Earth MOID = .928939 au   Jupiter MOID = 2.36824 au   T_jup = 3.450  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.32   n/a E2021B55   102221 (1999 TT9)          Discovered 1999-Oct-07 by Korlevic, K., Juric, M. at Visnjan Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-05 02:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin